Book/Report

FZJ-2018-01910

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A real time 155 GHz millimeter wave interferometer module for electron density measurement in large plasma devices

Hüttemann, P. W.FZJ* ; Waidmann, G.FZJ*

1982
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/17700

Report No.: Juel-1802

Abstract: A homodyne, real time 155 GHz Interferometer channel is deseribed which is one module of a multichannei system for use an TEXTOR tokamale A standing sine wave is generated in a phase bridge by transmitting a frequeney modulated millimeter wave down two unequal interferometer branches. The presence of plasma produces a phase Slip of the sine wave with respect to a reference signal. The phase steift is linear proportional to plasma density for expected TEXTOR plasmas. Long plasma paths give multiradian phase shifts which are recorded by a digital fringe counting system. The accuracy of phase measurement is $\Delta \Phi$ = 2$\pi$/16. Phasechanges of 7$\pi$/8 are accepted per modulation period. The microwave in the measurement brauch of the interferometer is transmitted using a quasioptical technique. Components and technical details are described. The interferometer was tested in a simulation set-up and in two different plasma experiments. Experimental results are presented.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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